Pierre Jules César Janssen (22 February 1824 – 23 December 1907), usually known as Jules Janssen, was a French astronomer who, along with English scientist Joseph Norman Lockyer, is credited with discovering the gaseous nature of the solar chromosphere, and with some justification the element helium. == Life, work, and interests == Janssen was born in Paris (During Bourbon Restoration in France) into a cultivated family.
Pierre Jules César Janssen (22 February 1824 – 23 December 1907), usually known as Jules Janssen, was a French astronomer who, along with English scientist Joseph Norman Lockyer, is credited with discovering the gaseous nature of the solar chromosphere, and with some justification the element helium. == Life, work, and interests == Janssen was born in Paris (During Bourbon Restoration in France) into a cultivated family.
Source: Wikipedia "Pierre Janssen" · CC BY-SA 4.0
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